I'm Trying To Hook Up Another Hot Water Tank So I Have More Hot Water I Have One Hooked Up And Have A Pump On It To Circulate The Water Thruogh A Coal Furnace And Was Wondering Where To Tie The Water Lines For The Second Tank Into

Hi Ashlyn,

To add more volume to your hot water you would hook hook the two heaters in parallel, hot to hot, cold to cold. Good luck, Tom

Please ensure you have an adequete mains water supply for this operation or else you will not replenish the CWS tank/tanks that are supplying the Hot water tanks ( cylinders).

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Originally Posted by jebster

Please ensure you have an adequete mains water supply for this operation or else you will not replenish the CWS tank/tanks that are supplying the Hot water tanks ( cylinders).

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Jebster, I don't understand your concerns. If he has enough "water supply" for his home then he has enough for his hot water system. Please explain your post. Regards, Tom

Tom's advice is correct. However, I am confused how/why you have a hot water volume issue. You have a water heater, a circulation plumb and you run it through a furnace (hows that work). What is the sq/ft of the home and the size of the heater, and the length of your longest run. Something seems out of wack.

Tom suggestion is one method of doing it. We prefer the other one. Just for your information: When we hook up two heaters side-by-side, we hook it up as follows:

Incoming cold water to the cold water inlet on 1st heater
Outgoing Hot water from 1st heater to Incoming Cold water on 2nd heater
Outgoing Hot water on 2nd heater to Outgoing Hot water to the house.

Thermostat settings are as follows: 1st heater 110F, Second heater 125F.

If you have hot water circulating pump, we hook up return line to the incoming cold water line on 1st heater with 2 back-flow check valves.

Milo,
You have a series hookup. Using one heater as a "kicker heater". This isn't what the OP asked for. He want's more volume. That's attained with a parallel hook up Lay it out on paper and see which hook up gives the most consistent volume. Kicker (series) heaters are used to supply hot water to distant fixtures while parallel heaters give you added storage and volume. Regards, Tom

Both set ups will give him/her volume. Volume delivery to his/her fixture is limited by size of hot water pipe.

Ashlyn, can you be more specific ? Thanks...

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Originally Posted by Milo Dolezal

Both set ups will give him/her volume. Volume delivery to his/her fixture is limited by size of hot water pipe.

Ashlyn, can you be more specific ? Thanks...

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But a parallel hook up makes more sense. If it doesn't please explain why a series hookup's better. Regards, Tom